Written by Sam Ruby, Dave Thomas, and David Heinemeier Hansson, Agile Web Development with Rails 4 is one of the original books on developing with Ruby on Rails.
I picked up the 1st edition back in 2006. It was to light my path towards a professional Rails career. Instead I was quickly acquired by a .NET shop and my Rails dreams were put aside. After newer additions, I picked the book up several times only to get distracted with something else again. With the release of Rails 4, and with some encouragement from a friend, I picked the book back up, eager to use Rails for my next project. This week I finished the book.